Should have.
The past tense is should.
Should is present tense.
The past tense of 'lase' (as in: to use a laser) should be 'lased'.
The past tense of glide is glided. (Although personally, I think it should be glid or glode!)
the past tense of am is was and the past tense of has is had
The past tense is should.
Should is present tense.
It is - as in the past subjunctive 'I should'
Past tense.
The past tense is should. e.g. I should have known better.
Should is the past tense of the verb shall.
You can use should in past tense to say;Should haveShould not have (shouldn't)
The past tense of 'lase' (as in: to use a laser) should be 'lased'.
The traditional tense is past tense.
Usage of Past Tense or Present Tense is all depends on the topic.
The past tense of glide is glided. (Although personally, I think it should be glid or glode!)
the past tense of am is was and the past tense of has is had